Made of durable plastic covered with material so your hand does not touch the stone.
I would like to inform you of a way to make this yourself, so you can  help your junior program or your club members. Instead of buying this from me if you use the black plastic tubes that are used to hold your golf clubs in your golf bag it work just as good as what I make and you save some money.
Please send an e mail with your phone number included with your purchase. The Courier company needs it to call you if you are not at home or to get directions.